The serphoid and chalcidoid parasites of the hessian fly
By: by A.B. Gahan.
Series: Miscellaneous publication / United States Department of Agriculture -- no. 174; Miscellaneous publication (United States. Dept. of Agriculture) -- no. 174.
Publisher: U.S. Dept. of Agriculture
Published: 1933
Place of publication: Washington, D.C
Language: eng
Number of pages: 148
Subjects: Hessian flies -- Parasites.; Host-parasite relationships.; Parasitic insects -- United States -- Classification.
Genres: Classification.
Notes: Caption title.

"December, 1933."

Includes bibliographical references.